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Commit 06c77f56 authored by Nishad Kamdar's avatar Nishad Kamdar Committed by Jonathan Cameron
Browse files

staging: iio: ad7816: Do not use busy_pin in case of AD7818 



AD7818 does not support busy_pin functionality as per datasheet.
Hence drop busy_pin when AD7818 is used.

Signed-off-by: default avatarNishad Kamdar <nishadkamdar@gmail.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 723a61e0

drivers/staging/iio/adc/ad7816.c

+24 −11
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ 
 */



struct ad7816_chip_info {

	kernel_ulong_t id;

	struct spi_device *spi_dev;

	struct gpio_desc *rdwr_pin;

	struct gpio_desc *convert_pin;
@@ -52,6 +53,12 @@ struct ad7816_chip_info { 
	u8  mode;

};



enum ad7816_type {

	ID_AD7816,

	ID_AD7817,

	ID_AD7818,

};



/*

 * ad7816 data access by SPI

 */
@@ -78,8 +85,10 @@ static int ad7816_spi_read(struct ad7816_chip_info *chip, u16 *data) 
		gpiod_set_value(chip->convert_pin, 1);

	}



	if (chip->id == ID_AD7816 || chip->id == ID_AD7817) {

		while (gpiod_get_value(chip->busy_pin))

			cpu_relax();

	}



	gpiod_set_value(chip->rdwr_pin, 0);

	gpiod_set_value(chip->rdwr_pin, 1);
@@ -359,6 +368,7 @@ static int ad7816_probe(struct spi_device *spi_dev) 
	for (i = 0; i <= AD7816_CS_MAX; i++)

		chip->oti_data[i] = 203;



	chip->id = spi_get_device_id(spi_dev)->driver_data;

	chip->rdwr_pin = devm_gpiod_get(&spi_dev->dev, "rdwr", GPIOD_IN);

	if (IS_ERR(chip->rdwr_pin)) {

		ret = PTR_ERR(chip->rdwr_pin);
@@ -373,13 +383,16 @@ static int ad7816_probe(struct spi_device *spi_dev) 
			ret);

		return ret;

	}

	chip->busy_pin = devm_gpiod_get(&spi_dev->dev, "busy", GPIOD_IN);

	if (chip->id == ID_AD7816 || chip->id == ID_AD7817) {

		chip->busy_pin = devm_gpiod_get(&spi_dev->dev, "busy",

						GPIOD_IN);

		if (IS_ERR(chip->busy_pin)) {

			ret = PTR_ERR(chip->busy_pin);

			dev_err(&spi_dev->dev, "Failed to request busy GPIO: %d\n",

				ret);

			return ret;

		}

	}



	indio_dev->name = spi_get_device_id(spi_dev)->name;

	indio_dev->dev.parent = &spi_dev->dev;
@@ -409,9 +422,9 @@ static int ad7816_probe(struct spi_device *spi_dev) 
}



static const struct spi_device_id ad7816_id[] = {

	{ "ad7816", 0 },

	{ "ad7817", 0 },

	{ "ad7818", 0 },

	{ "ad7816", ID_AD7816 },

	{ "ad7817", ID_AD7817 },

	{ "ad7818", ID_AD7818 },

	{}

};